java对象属性复制

java对象属性复制的工具类很多,常用的有org.springframework.beans.BeanUtils#copyProperties,org.apache.commons.beanutils.BeanUtils#copyProperties,这两个都是通过反射实现的,性能嘛,你关心TA就在那里,你不关心TA还是在那里.

高级点的有net.sf.cglib.beans.BeanCopier,通过生成源代码实现属性复制,但是他的api很难使用.而且不支持基本类型和包装器类型的转换(java的boxing和unboxing只是语法糖而已).

so,重新造了个轮子,采用javassit来生成源代码,并且提供方便使用的api.

使用就像下面这样:

TestBean target = new TestBean();
Copier.copy(TestBean1.createTest(), target);

TA生成的源代码如下:

public class CopierImpl1002
  implements Copier.Copy
{
  public void copy(Object paramObject1, Object paramObject2)
  {
    TestBean localTestBean = (TestBean)paramObject1;
    TestBean1 localTestBean1 = (TestBean1)paramObject2;
    if (localTestBean.getA1() != null)
          localTestBean1.setA1(localTestBean.getA1().longValue());
    localTestBean1.setA10(localTestBean.getA10());
        localTestBean1.setA2(localTestBean.isA2());
       localTestBean1.setA3(Integer.valueOf(localTestBean.getA3()));
       localTestBean1.setB8(Short.valueOf(localTestBean.getB8()));
        localTestBean1.setList(localTestBean.getList());
  }
}

源代码见:https://gist.github.com/bohrqiu/5046a2a7d983996f0e5a